Archived posting to the Leica Users Group, 2001/10/05

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Subject: Re: [Leica] aperature values
From: Marc James Small <>
Date: Fri, 05 Oct 2001 17:04:23 -0400

At 12:01 PM 10/5/01 -0700, Feliciano di Giorgio wrote:
>I'm having a terrible time with converting modern International
>aperature values to pre-war German numbers. Anyone have a chart or
>conversion method?

No rocket science here, Feliciano.  They are just 1/3 of a stop apart.
Both scales are geometric in their progression -- that is, each f/stop
admits 1/2 the light of the next-larger size.

Marc  FAX:  +540/343-7315
Cha robh bąs fir gun ghrąs fir!

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